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TOWARD RESOLUTION OF THE “FUZZY NODES” IN GREEN PLANT PHYLOGENY D. Mandoli, R. Olmstead, B. Mishler, J. Boore, A. Smith, K. Renzaglia, P. Wolf, M. Donoghue, C. O’Kelley
Contact information for all PI’s is given on the back of the mini-poster handouts below. 36 The tree of life is inherently fractal. Look closely at one lineage of a phylogeny and it dissolves into many separate lineages, 10 and so on down to a very fine scale. There is now a great body of phylogenetic research that has provided numerous tools applicable at particular, usually fairly constrained, scales. These tools have left many phylogenetic questions unanswered. We think these questions will remain unanswered until it is possible to do analyses across multiple scales. The green plant lineage represents the most suitable system for this research because it is one of the oldest and most diverse branches of the tree of life and it contains good examples of the known phylogenetic problems. Investigations on it may draw on a tradition of interdisciplinary collaborative research, facilitated by the Green Plant Phylogeny Research Coordination Group (GPPRCG, "Deep Green"). 35 11 Our overall objective is to resolve the primary pattern of evolutionary diversification among green plants, and establish a model for doing so that will be applicable to other groups of organisms with long evolutionary histories. We believe that a solid backbone based on genomic and ultrastructural data for selected exemplar taxa will enable the integration of previous and ongoing studies of many more taxa into a comprehensive picture of green plant phylogeny. To achieve this objective, we will:
34 * complete a matrix of whole genome sequences for chloroplasts and mitochondria, and develop Bacterial Artificial Chromosome (BAC) nuclear genome libraries (when 1C† 100Mb) for ~50 representatives of the critical deep-branching 12 lineages of green plants (Fig. 1); * produce a comprehensive set of comparable morphological and ultrastructural data for these same taxa; * incorporate inferences from across the phylogenetic hierarchy in green plants using methods designed to permit scaling across studies.
33 The full text of this document can be found at: http://faculty.washington.edu/mandoli
SPECIES
Nephroselmis olivacea 12 Pterosperma sp. Chlorella sp. 24 Prototheca wickerhamii 13 Tetraselmis striata Volvox carteri 6 Chlamydomonas reinhardii 8 Oltmannsiellopsis viridis Ignatius tetrasporus Halochlorococcum moorei Ulothrix sp. 10 14 32 Acrochaete endozoica Bolbocoleon proliferum Ulva lactuca 7 Trentepohlia sp. 17 Blastophysa rhizopus Chaetosiphon moniliformis Cladophora sp. 15 31 Caulerpa taxifolia 19 Codium decorticatum Ostreobium queketii Acetabularia acetabulum 13, 34 Bornetella sphaerica 20 Mesostigma viride 3 29 30 Coleochaete orbicularis Chara aspera 16 16 Klebsormidium flaccidum 4 Entransia sp. Chlorokybus atmophyticus 28 Spirogyra sp. 30 Anthoceros sp. 31 Notothylas orbicularis 29 Sphaerocarpos sp. 23 17 Marchantia polymorpha Blasia pusilla 26 Bazzania trilobata 18 Haplomitrium sp. 11 Sphagnum palustra 14 Takakia ceratophylla 21 Physcomitrella patens 28 Andreaea sp. 18 Tortula ruralis 2 Selaginella kraussiana 35 1 Isoetes englemanii 5 Lycopodium lucidulum 22 Figure 1. Outline phylogeny of the green plants, indicating the currently understood phylogenetic position Equisetum hyemale 33 for 51 candidate exemplar organisms (represented by generic names; see Table 1) and the higher-level Psilotum nudum 36 taxa to which they are thought to belong. All branches are subject to further testing, but the best-supported 27 27 Botrychium sp. branches with current data are indicated with a thick line, branches with some support are indicated with 19 Angiopteris evecta 15 a thin line, and areas of the tree that remain controversial are indicated by labelled ovals. 1. Base of green Osmunda cinnamomea 9 plants: outgroup relationships and basal branching among prasinophytes. 2. Relationships among major Ceratopteris richardii 1 lineages of Chlorophyta (some groupings are more firmly established, e.g. Ulvales/Ulotrichales, Marsilea quadrifolia 32 Chlorophyceae/Trebouxiophyceae). 3. Relationships among the siphonous algae and their placement in the Chlorophyta. 4. Base of the land plants. 5. Base of the ferns (moniliforms).
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